Roasting-furnace.



E. J. FOWLER.

ROASTING FURNACE.

APPLICATION TILED MAY3,1913.

Patented Nov. 25, 1913.

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mommy Lennon.

En sgr'Al'rns Arnnr enrich EpwARo-i rownm, s mnwoon cm cmronnm, 553mmsro Mamie FOUN- DRY'COL'QANY, Q1 SALl-MGISQO, GALIBORNIA; A CORPORATION01! CALIFORNIA.

ROA TING-FURANAQEQ To all whb'm it min/.concei'n V X a citizen of theUnited- States,

' Redwood Cit Be it known that I, Eowmn J. FOWLER, residin at Y andState of alifor'nio, have invented certo the accompanying "provedcirculation on is a, specification.

My invention relates to the class of roasting-furnaces em iloying averticul series hi hearths successively communicating at rim and centeralternately, and having rabblearms rotating above each hearth and drivene by a central. shaft; and it espeoiull relates. 15

to those furnaces of this glass in w iich air is employedto serve thedouble function of cooling the rubble-arms and furnishing oxygen to thefurnace. My invention has for its object'the better ucconmlishment ofbotli these. functions and of stiffening andstrengthening the rabblearms, said objects being attained by an imdisposition of the air; and-tothis end thy invention consisis in a furnace of this ty 6 provided. witha novel and improved Itahie-arm as the instrunientnlity by whichtheresnlt' is reached, all as I shall now iullcflileserihe by referencewings in \vhieh- Figure 11s 11 vertiezil section of my fur nace. Fin. .2ion horizontal section ,of one of the whine-arms. Fig. 3 "is an innerend elevation of the arm of Fig. 9,. Fig. l is a horizontal section ofa. rubble-agar em;

hodying my invention but-slightly modified with respect to the number ofits air delivery openings.

1 is the furnace shell.

municutiu Y successively-at the center open ings 3 an the rim openings'2, alternately, iii-usual m.ann'er. l

5 is the centrnl shzift driven in suitable.

manner, as, for example, by the main 6 heloiv, through the genrsj'.

8 is a clutch on the main shaft-.- 9 is the smoke flue above thefurnace,

she ft which receives the smoke hrough the out; his 10. I i

ere secured to the rotating; shaft in any suitable manner. Forillustnltion here Specialisation of Letters Patent. App ication exam; 8,1818. Serial No. 755,252.

in the muntyofi Sun'Mii-teo 'fquier end of the other. channel 18.

.ilS-COKIHQCHOIX with the central shaft is made but, its osition.proximate to theinner ehcl 2 are the hearthstin vertical series eoui-Patentezile'ov'. 215, 1913.

show u fhuige-li on the inner end of the arm, which lshoh'ed to a flange15 on the shaft.-- T

The shaft 5 is'hollow throughout its length. its foot. is closed, butits upper end so,

which extends through the furnace top has rotary eomiection with anelbow 5 \vhirh elbow is to have. communication with-n source of airunder pressure, not shown. Each ru'ehie-urn: 12 is also hollowthroughout iw length. Its outer end is closed, but its inner end is infree communimtionwith the cxvit or here of the central shaft 5. Eachmhh1e i l arm is fitted or armed with un-innervparti tron wall 16 whichlies in the Verticul median longitudinal. pique oflthe arm and traversesthe em-itythereof from top to bottom. This partition 16 it iii: innerend springs from the, side wall of the arm and thence extends toward butterminates short of the outer closed end of the arm, so that the envityof the arm is divided into two longitudhnully directed channels 17 and18, one of which L? at its inner end communicates freely with the'curitof the and at its outer eml conumlnicates with the.

In the side wall of (the arm proximate to an Opening 19, which leadsfromthe inner' and of the arm channel lsdirectly into the furnace. Thisopening; 19 neerl not he asingle' 0 ening as is shown in Figs. l and 2,for as fishow in Fig. -l,;it may lie plurui,

of: the arm is essential in orr to provide. for the necessary maximumair circulation lhroughoutsaid urrn. It will now be seen thatthe aircireulating throughout the length or the arm fi'om its inner end to itsouter end and back againto 4 its inner end has a maximnm ccnrse' length,conduci e to its function of cooling the arm; and it will be seenfurther that said air, heated to its best efiicieney by reason of itsextensive course, is dischargedinto'the furnaee with such udvantuge'aswill follow the supply of heated air thereto, Furthermore, this air bykeeping; the puitie tinn Wall 16 cooler than the outside walls of 9elaborate this, I may state that in practice central shaft 5-86 thispartition wall 16 is. preferably of cast -iron,'and as it will bekept bythe air at approximately 700 to 800 degrees l ahr. and as at suchtemperature castiron is at its of the shaft is'cont-inuous. This resultsin maximum strength, it will twat-strengthen and stiffen the arm andkeep it from sagmg. t

It is to be noted that the cavityfior bore furnishi practically equallycool air to all the 'rabb -arms, instead of increasingly heated air tosuecessivearms, as would be the case if the cavity of the shaft were.so

-;obstr ucted as'to cause the same air to. circulate -from the shaft,through oneset or tier of armsand back again to the shaft,.then througha succeeding set of arms and back "-to the shaft and so--on.

In a roasting furnace of the described "class, the combinationof-thehearthsj a'sing'le. central rotatable hollow shaft having acontinuous longitudinal cavity adapted to fifeceive'and convey' air; andthehollowrabblearms connected at their inner ends with said shaft andhaving their outer ends. closed,

each of said arms having within it alongitudinal partition wallterminating short of the closed outer end of the arm and divid-,

ing its cavityinto two longitudinally directed channels, one of whichcommunicates at its inner endwith the cavity of the hollowcentra-l-sha-ft, and at its outer end with the other channel, saidlatter channel at its in-- her end being closed to the cavity of said-Ewnain) J. FOWLER.

Witnesses: I i

' l VM. F Boo'rrr, D. B. RIbHARDa

